Update versions information in HostAgent binary

[sachinkumarsingh092]

What this PR does / why we need it:
The version flag in the host agent binary displays the major, minor and patch versions.
This PR introduces the following flags, similar to kubectl or clusterctl, and removes the patch field from version information.

$ ./bin/byoh-hostagent-linux-amd64 --version
byoh-hostagent version: version.Info{Major:"0", Minor:"1", GitVersion:"v0.1.0-79-42e700c78428bb-dirty", GitCommit:"42e700c78428bb4c2096a85f5641565375d666d0", GitTreeState:"dirty", BuildDate:"2022-03-23T12:29:43Z", GoVersion:"go1.16.6", Compiler:"gc", Platform:"linux/amd64"}

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #436

Additional information
Changes:

• .github/workflows/draft-release.yaml: Now we extract version from the hack/version.sh script so no need for AGENT_BINARY_VERSION.
• Makefile: Now we use ldflags that are generated from the version.sh script.
• agent/host_agent_test.go: Tests for the agent version are changed according to the new format.
• agent/version/version.go: All the new required fields are introduced. We take the values of these fields from the variables generated by ldflags during building the binary.
• agent/version/version_test.go: The tests for version.go. We build a fake binary and check its version info based on the given ldflags and compare these values. Due to the overhead of building and testing continuously, only 2 corner cases are checked which should suffice for all the cases.
• hack/version.sh: The script with all the logic to assign values for the different fields in the ldflags. It uses git describe to extract all the information required for different fields. This is taken form sigs.k8s.io/cluster-api/hack/version.sh.

Special notes for your reviewer

[codecov-commenter]

Codecov Report

Merging #454 (06f7ef6) into main (1e2520f) will decrease coverage by 0.50%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #454      +/-   ##
==========================================
- Coverage   67.69%   67.19%   -0.51%     
==========================================
  Files          23       22       -1     
  Lines        1746     1719      -27     
==========================================
- Hits         1182     1155      -27     
  Misses        492      492              
  Partials       72       72              

Impacted Files	Coverage Δ
agent/installer/installer.go	78.10% <0.00%> (ø)
agent/installer/bundle_downloader.go	69.66% <0.00%> (ø)
agent/version/version.go

[anusha94]

Sample Release - https://github.com/anusha94/cluster-api-provider-bringyourownhost/releases/tag/v0.0.15

[anusha94]

• Removing version_test and suite because all the logic is now moved to hack/version.sh
• we have one integration test in host agent to verify ldflags on the binary

[anusha94]

lgtm!

[dharmjit]

lgtm